Selecting The Cables; Selecting The Power Supply Unit - Festo CDVI-DN Manual

1. Installation

1.4.2 Selecting the cables

1.4.3 Selecting the power supply unit

Festo P.BE-CDVI-DN-EN en 0805a
Calculate the required cable cross section and the maxi-
•
mum permitted line length.
Avoid long distances between the power supply unit
•
and the valve terminal. Long cables reduce the voltage
supplied by the power supply unit.
Make sure the cables and sockets meet the ambient condi-
tions (e.g. cleaning agents used) and fulfil the requirements
of IP protection class.
Warning
Use only PELV circuits as per IEC/DIN EN 60204-1 for
•
the electric power supply (protective extra-low voltage,
PELV).
Also observe the general requirements for PELV circuits
laid down in IEC/DIN EN 60204-1.
Use only power sources that guarantee reliable
•
electrical isolation of the operating voltage as per
IEC/DIN EN 60204-1.
Protection against electric shock (protection against
direct and indirect contact) is guaranteed in accordance
with IEC/DIN EN 60204-1 by using PELV circuits (electrical
equipment of machines, general requirements).
Recommendation:
Use controlled power supply units.
•
Before selecting the power supply units, calculate
•
the total current requirement in accordance with
section 1.4.1.
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